Chromiferous azo-dyestuffs and process of making same



erases ECAL INST- The present invention relates to the manu As din o-components for making the parent dyestufis for this invention there come into consideration. in particular the diazocompound of l-chloro-2-amino-1-phenol-6- sulfonic acid, of 6-chioro-2-amino-1-phenoll-sulfonic acid and of l-chlorO-Q-amino-L Example 1 4%.? parts of the azo-dyestuif from diazotized d-chloro-Q-am'ino-l-phenol-G-sulfonic acid and l-hydroxynaphthaleue-5-sulfonic acid of the formula 1 C1- soin I V SOaH are dissolved in 1600 parts of hot Water and Ann nnns'r :snunnnn, or BASE-L, swrtr znnrlartll ASSIGHQES ro a r in Basins, or arisen .sur rznanann Ann rnocnss or arairrne sann No. 620,307, and" in Switzerland September 29, 1931. i

the solution is mixed with 11.4 parts of chromium oxide (100'uper cent. strength) in the form of a chromium fluoride solution and boiled in a refiux apparatus for some time. After cooling, thechromium compound thus '55 producedis salted out, filtered and Washed with common salt solution of 10 per cent. strength, and finally dried.v it is a violet brown powder, soluble in water, sodium bonate solution of 10 per centstrength or caustic soda solution of 10 per cent. s" *ength. to a reddish-violet solutiomand in concentrated sulfuric acid to a. green solution. It dyes Wool in abath acid witlrsulfuric acid blue-violet tints of good prope ties offa stness.

Chromium compounds with similar properties are obtained when the chroming is accomplished by means of other agents yieldingchromium, such as chromium formats, chromium sulfate, chromium chloride.

gEwa-mple' 2 A dye-bath is'prepared containing 3 per cent. of sulfuric acid of 60 Be. and the W 30i is handled in this bath at 60 C. for 1045 minutes. The thoroughly dissolved dyestun produced as described in Example 1, is then added to the bath and dyeing is con for hour at 60 C. and the bath is tnen gradually raised to the boil, Whereafter a further 5 per cent. of sulfuric acid of 86 Be. is added. Boiling follows for to hour 1 until the color tint is fully developed.

l/Vhat We claim is p l. Process for the manufacture of chromif= erous also-dyestuffs, consisting in treating with agents yielding chromium azo-dyestuifs 1 of the general formula 90 2. Process for the manufacture of chromif- 3 erous" aZo-dyestulfs, consist ng intreatlng stuff of the formula with agents yielding chromium azo-dyestufi's of the general formula 3. Process for the manufacture of a chro-' miferous azo-dyestufi', consisting in treating with agents yieldlng chromlum the azo-dye- 01 -SO3H 05H. 4. Chromiferous azo-dyestuffs, which azodyestuffs correspond with the general formula which products form violet-brown powders which dissolve in water and dilute alkalies to violet and in concentrated sulfuric acid to green solutions, dyeing wool blue-violet tints of good fastness properties.

5. Chromiferous azo-dyestufls, which 2120- dyestuffs correspond with the general formula which products form violet-brown powders which dissolve in water and dilute alkalies to violet and in concentrated sulfuric acid to green solutions, dyeing wool blue-violet tints which product forms a violet-brown powder 1' which dissolves in water and dilute allzalics to violet and in concentrated sulfuric acid to green solutions, dyeing wool blue-violet tints of good fastness properties.

In witness whereof we have hereunto signed 2 our name this 18th day of June 1932.

FRITZ STRAUB.

ERNST BRUNNER. 

